Scholarlink

<p>The deformation characteristics of geosynthetic-encased stone columns (GESCs) under load and the interaction behavior between the columns and the surrounding soil are critical factors affecting the overall bearing capacity of the composite foundation. Based on the transparent soil technique, this study conducted laboratory model tests to investigate the effects of encasement length, column length, and geosynthetic strength on the load–settlement behavior, surrounding soil displacement, stress concentration ratio, and load transfer mechanisms of GESC composite foundations. Simultaneously, discrete element numerical models were established using PFC to analyze the deformation and failure characteristics of GESC under different parameters. The results show that for different encasement lengths, the increase was only 3% when the encasement length was extended from 12 to 16<i>D</i> (where <i>D</i> is the column diameter), indicating a significant reduction in the improvement rate. This demonstrates that encasement length of 12<i>D</i> is the optimal configuration, making full-length reinforcement unnecessary. For different column lengths, when the column length was increased from 4<i>D</i> to 8<i>D</i>, the ultimate bearing capacity improved significantly, with a growth rate of 84%. As the column length extended from 8 to 12<i>D</i>, the ultimate bearing capacity increased by 58%, while the column exhibited negligible punching deformation, and its deformation was primarily characterized by compression. When the column length was further increased from 12 to 16<i>D</i>, the ultimate bearing capacity rose by only 1.71%, indicating that the load-bearing performance of a 12<i>D</i>-long floating column approaches that of an end-bearing column. For columns with 12<i>D</i> and 16<i>D</i> length, the maximum radial and vertical displacements occurred at the column top, characterized by bulging failure of column. For different geosynthetic strengths, the ultimate bearing capacity of the foundation increased with the geosynthetic strength.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Experimental study and numerical simulation of geosynthetic-encased stone column composite foundation based on transparent soil technique

  • 期刊论文

  • 发表日期：

    2026年5月5日

查看全文
  • Liangyong Li,
  • Yang Gao,
  • Houyang Li,
  • Tianxiang Peng,
  • Gengxin Li,
  • Lin Yang,
  • Jiacheng Chen

摘要

The deformation characteristics of geosynthetic-encased stone columns (GESCs) under load and the interaction behavior between the columns and the surrounding soil are critical factors affecting the overall bearing capacity of the composite foundation. Based on the transparent soil technique, this study conducted laboratory model tests to investigate the effects of encasement length, column length, and geosynthetic strength on the load–settlement behavior, surrounding soil displacement, stress concentration ratio, and load transfer mechanisms of GESC composite foundations. Simultaneously, discrete element numerical models were established using PFC to analyze the deformation and failure characteristics of GESC under different parameters. The results show that for different encasement lengths, the increase was only 3% when the encasement length was extended from 12 to 16D (where D is the column diameter), indicating a significant reduction in the improvement rate. This demonstrates that encasement length of 12D is the optimal configuration, making full-length reinforcement unnecessary. For different column lengths, when the column length was increased from 4D to 8D, the ultimate bearing capacity improved significantly, with a growth rate of 84%. As the column length extended from 8 to 12D, the ultimate bearing capacity increased by 58%, while the column exhibited negligible punching deformation, and its deformation was primarily characterized by compression. When the column length was further increased from 12 to 16D, the ultimate bearing capacity rose by only 1.71%, indicating that the load-bearing performance of a 12D-long floating column approaches that of an end-bearing column. For columns with 12D and 16D length, the maximum radial and vertical displacements occurred at the column top, characterized by bulging failure of column. For different geosynthetic strengths, the ultimate bearing capacity of the foundation increased with the geosynthetic strength.